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3. Plants use sunlight, water, and carbon dioxide to make food (glucose).
4. Humans can add phosphorus into the cycle by using this which can lead to algae blooms.
5. Bacteria turn nitrates back into nitrogen gas in the air.
6. Decomposers break down waste or dead things and release ammonium.
7. Bacteria (or lightning) change nitrogen gas into a form plants can use.
8. A process that repeats over and over.
10. A Cycle that includes uplift and weathering of rock.
12. Organisms that break down dead plants and animals and return nutrients to the soil.

1. Living things use oxygen and release carbon dioxide for energy.
2. Soil bacteria change ammonium into nitrates that plants need.
9. A cycle that includes animal respiration, root respiration, and photosynthesis.
11. Energy sources like coal, oil, and gas that form from ancient life.